container/list: fix typo in function comments

The correct word to use here is 'another' not 'an other'

Change-Id: Ie4f748ae94a5945dceb52779222ffd8cf36b8845
Reviewed-on: https://go-review.googlesource.com/c/go/+/235838
Reviewed-by: Robert Griesemer <gri@golang.org>
diff --git a/src/container/list/list.go b/src/container/list/list.go
index cc9ff09..210424c 100644
--- a/src/container/list/list.go
+++ b/src/container/list/list.go
@@ -219,7 +219,7 @@
 	l.move(e, mark)
 }
 
-// PushBackList inserts a copy of an other list at the back of list l.
+// PushBackList inserts a copy of another list at the back of list l.
 // The lists l and other may be the same. They must not be nil.
 func (l *List) PushBackList(other *List) {
 	l.lazyInit()
@@ -228,7 +228,7 @@
 	}
 }
 
-// PushFrontList inserts a copy of an other list at the front of list l.
+// PushFrontList inserts a copy of another list at the front of list l.
 // The lists l and other may be the same. They must not be nil.
 func (l *List) PushFrontList(other *List) {
 	l.lazyInit()